Samsung Electronics Co., the world's top smartphone maker that recorded a three-year-low bottom line last year, posted the worst net sales on its home soil in eight years in that period, weakened by its sluggish handset business, an audit report showed Monday. Net sales of the South Korean tech powerhouse reached 20.7 trillion won in Asia's fourth-largest economy in 2014, down 9 percent from a year earlier, according to the accountant's report on the company.